An acid tastes sour, and a base feels soapy, but you should never taste a chemical to find out. In this course we learn to use indicators, we see what acids and bases do to metals, carbonates and each other, and we find out what makes a substance an acid.
3 lessons, about 1 h 15 min3 simulations10 problems6 practice questionsPython in every lesson
Created by StemPy LabAn acid is sour and turns blue litmus red. A base is bitter and slippery and turns red litmus blue. An indicator is a substance that shows by its colour if a solution is acidic or basic. We never taste a chemical to test it.
Acids react with metals to give a salt and hydrogen, with carbonates and hydrogencarbonates to give a salt, water and carbon dioxide, and with bases to give a salt and water. Metal oxides are basic and non-metal oxides are acidic.
All acids give hydrogen ions, H+, in water, and all bases that dissolve give hydroxide ions, OH-. These ions let the solution carry a current. A strong acid or base gives many ions, and a weak one gives few. Acid must always be added to water, never the reverse.
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With Standard, you also open 4 more problems and 1 Python lab. Everything you have used here stays free, always.